Answer:
Angle A= 120⁰.. Angle B=60⁰
Step-by-step explanation:
To find angle A, you subtract 60 from 180, which would be 120. Angle A and 60⁰ are supplementary angles, meaning they have to add up to 180.
To find angle B, you take 360, since all the interior angles of that shape add up to 360.
360-90-90-120=60
